From 94a79a605f3e76a43f1f87a5044f6761b99e5ca5 Mon Sep 17 00:00:00 2001
From: Vicent Marti <tanoku@gmail.com>
Date: Wed, 10 Sep 2014 18:33:27 +0200
Subject: Cleanup reference implementation

---
 src/references.c | 109 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 src/references.c

(limited to 'src/references.c')

diff --git a/src/references.c b/src/references.c
new file mode 100644
index 0000000..ff64b00
--- /dev/null
+++ b/src/references.c
@@ -0,0 +1,109 @@
+#include "stmd.h"
+#include "utf8.h"
+#include "references.h"
+
+static unsigned int
+refhash(const unsigned char *link_ref)
+{
+	unsigned int hash = 0;
+
+	while (*link_ref)
+		hash = (*link_ref++) + (hash << 6) + (hash << 16) - hash;
+
+	return hash;
+}
+
+// normalize reference:  collapse internal whitespace to single space,
+// remove leading/trailing whitespace, case fold
+static unsigned char *normalize_reference(chunk *ref)
+{
+	strbuf normalized = GH_BUF_INIT;
+
+	utf8proc_case_fold(&normalized, ref->data, ref->len);
+	strbuf_trim(&normalized);
+	strbuf_normalize_whitespace(&normalized);
+
+	return strbuf_detach(&normalized);
+}
+
+static void add_reference(reference_map *map, reference* ref)
+{
+	ref->next = map->table[ref->hash % REFMAP_SIZE];
+	map->table[ref->hash % REFMAP_SIZE] = ref;
+}
+
+extern reference *reference_create(reference_map *map, chunk *label, chunk *url, chunk *title)
+{
+	reference *ref;
+	ref = malloc(sizeof(reference));
+	ref->label = normalize_reference(label);
+	ref->hash = refhash(ref->label);
+	ref->url = clean_url(url);
+	ref->title = clean_title(title);
+	ref->next = NULL;
+
+	add_reference(map, ref);
+
+	return ref;
+}
+
+// Returns reference if refmap contains a reference with matching
+// label, otherwise NULL.
+reference* reference_lookup(reference_map *map, chunk *label)
+{
+	reference *ref = NULL;
+	unsigned char *norm;
+	unsigned int hash;
+	
+	if (map == NULL)
+		return NULL;
+	
+	norm = normalize_reference(label);
+	hash = refhash(norm);
+	ref = map->table[hash % REFMAP_SIZE];
+
+	while (ref) {
+		if (ref->label[0] == norm[0] &&
+			!strcmp((char *)ref->label, (char *)norm))
+			break;
+		ref = ref->next;
+	}
+
+	free(norm);
+	return ref;
+}
+
+static void reference_free(reference *ref)
+{
+	free(ref->label);
+	free(ref->url);
+	free(ref->title);
+	free(ref);
+}
+
+void reference_map_free(reference_map *map)
+{
+	unsigned int i;
+
+	for (i = 0; i < REFMAP_SIZE; ++i) {
+		reference *ref = map->table[i];
+		reference *next;
+
+		while (ref) {
+			next = ref->next;
+			reference_free(ref);
+			ref = next;
+		}
+	}
+
+	free(map->table);
+	free(map);
+}
+
+reference_map *reference_map_new(void)
+{
+	reference_map *map = malloc(sizeof(reference_map));
+	memset(map, 0x0, sizeof(reference_map));
+	return map;
+}
+
-- 
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